#25 Demi Lovato "Give Your Heart A Break"

US singer Demi Lovato performs under heavy rain in Montevideo during her A Special Night tour on April 29, 2012. AFP PHOTO/Pablo PORCIUNCULA (Photo credit should read PABLO PORCIUNCULA/AFP/GettyImages)

#24 Neon Trees "Everybody Talks"

NEW YORK, NY - APRIL 18: Tyler Glenn, Elaine Bradley and Chris Allen of Neon Trees visit fuse's "Hoppus on Music" at fuse Studios on April 18, 2012 in New York City. (Photo by Cindy Ord/Getty Images)

#23 Gavin DeGraw "Not Over You"

NEW YORK, NY - APRIL 18: Gavin DeGraw performs on stage during the 3rd annual Origins Rocks Earth Month concert at Webster Hall on April 18, 2012 in New York City. (Photo by D Dipasupil/Getty Images)

#22 Taylor Swift "Eyes Open"

(Photo by Ethan Miller/Getty Images)

LAS VEGAS, NV - APRIL 01: Singer Taylor Swift accepts the Entertainer Of The Year Award onstage at the 47th Annual Academy Of Country Music Awards held at the MGM Grand Garden Arena on April 1, 2012 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

#21 Gavin DeGraw "Sweeter"

NEW ORLEANS, LA - MARCH 01: Gavin DeGraw attends The Escpae to Total Rewards at Woldenberg Park on March 1, 2012 in New Orleans, Louisiana. (Photo by Skip Bolen/Getty Images for Caesars Entertainment)

#20 Graffiti 6 "Free"

NEW YORK - OCTOBER 18: Graffiti 6 performs at Rockwood Music Hall on October 18, 2010 in New York City. (Photo by Joe Kohen/Getty Images)

#19 Adam Lambert "Never Close Our Eyes"

HOLLYWOOD, CA - APRIL 05: Singer Adam Lambert performs onstage at Logo's "NewNowNext Awards" 2012 at Avalon on April 5, 2012 in Hollywood, California. (Photo by Jason Merritt/Getty Images for LOGO)

#18 Carrie Underwood "Good Girl"

LAS VEGAS, NV - APRIL 01: Singer Carrie Underwood performs onstage at the 47th Annual Academy Of Country Music Awards held at the MGM Grand Garden Arena on April 1, 2012 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

#17 Adele "Set Fire To The Rain"

British singer-songwriter Adele accepts the British Female Solo Artist award at the BRIT Awards 2012 in London on February 21, 2012. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images)

#16 Maroon 5 w/ Wiz Khalifa "Payphone"

CARSON, CA - MAY 12: Singer Adam Levine of Maroon 5 performs at Wango Tango at The Home Depot Center on May 12, 2012 in Carson, California. (Photo by Kevin Winter/Getty Images)

#15 Christina Perri "A Thousand Years"

BERLIN, GERMANY - MARCH 22: Christina Perri and Jason Mraz perform at the Echo Awards 2012 at Palais am Funkturm on March 22, 2012 in Berlin, Germany. (Photo by Andreas Rentz/Getty Images)

#14 Matt Nathanson w/ Sugarland "Run"

NEW YORK, NY - DECEMBER 21: Musician Matt Nathanson perfomrs at 'PLJ's 20th Annual Scott & Todd's Live broadcast/auction at Blythedale Children's Hospital on December 21, 2011 in New York City. (Photo by Mike Coppola/Getty Images)

#13 Jessie J "Domino"

HOLLYWOOD, CA - APRIL 11: Singer Jessie J. attends the Third Annual ELLE Women In Music Event at Avalon on April 11, 2012 in Hollywood, California. (Photo by Michael Buckner/Getty Images)

#12 John Mayer "Shadow Days"

LAS VEGAS, NV - APRIL 30: Recording artist John Mayer performs during Tiger Jam 2011 at the Mandalay Bay Events Center April 30, 2011 in Las Vegas, Nevada. The event benefits the Tiger Woods Foundation. (Photo by Ethan Miller/Getty Images)

#11 Bruno Mars "It Will Rain"

US singer-songwriter Bruno Mars accepts the International Male Solo Artist award at the BRIT Awards 2012 in London on February 21, 2012. (Photo credit should read LEON NEAL/AFP/Getty Images)

#10 Jason Mraz "I Won't Give Up"

NEW YORK, NY - APRIL 26: Singer/songwriter Jason Mraz visits fuse's "Top 20" at fuse Studios on April 26, 2012 in New York City. (Photo by Charles Eshelman/Getty Images)

#09 The Wanted "Glad You Came"

LOS ANGELES, CA - APRIL 26: Members of the band The Wanted; (L-R) Nathan Sykes, Max George, Siva Kaneswaran, Tom Parker and Jay McGuiness attend British Pop Sensation The Wanted Take Over Planet Dailies at Planet Dailies & Mixology 101 on April 26, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Planet Dailies)

#08 Andy Grammer "Fine By Me"

MEMPHIS, TN - MARCH 27: Recording artist Andy Grammer poses with children from the Hoops for St. Jude program before a game between the Memphis Grizzlies and the Minnesota Timberwolves on March 27, 2012 at FedExForum in Memphis, Tennessee. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. Mandatory Copyright Notice: Copyright 2012 NBAE (Photo by Joe Murphy/NBAE via Getty Images)

#07 One Direction "What Makes You Beautiful"

(From L to R) Niall Horan, Louis Tomlinson, Harry Styles and Liam Payne of the British-Irish boy band One Direction perform during the group's concert at the St James theatre in Wellington on April 22, 2012. One Direction comprise of four young Britons and an Irishman, with their first album making its debut at number one on the US charts last month -- a feat never before achieved by a British band. AFP PHOTO / MARTY MELVILLE (Photo credit should read Marty Melville/AFP/Getty Images)

#06 Katy Perry "Part of Me"

(Photo by Jason Merritt/Getty Images)

CENTURY CITY, CA - MAY 10: Singer Katy Perry arrives at the NARM Music Biz Awards dinner party held at the Hyatt Regency Century Plaza on May 10, 2012 in Century City, California. (Photo by Jason Merritt/Getty Images)

#05 Adele "Rumour Has It"

British singer-songwriter Adele performs on stage at the BRIT Awards 2012 in London on February 21, 2012. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images)

#04 Gotye "Somebody That I Used To Know"

INDIO, CA - APRIL 15: Musician Wouter "Wally" De Backer aka Gotye performs during Day 3 of the 2012 Coachella Valley Music & Arts Festival held at the Empire Polo Club on April 15, 2012 in Indio, California. (Photo by Michael Buckner/Getty Images for Coachella)

#03 .Fun w/ Janelle Monae "We Are Young"

INDIO, CA - APRIL 17: (L-R) Musician Andrew Dost, singer Nate Ruess, musicians Emily Moore and Jack Antonoff of fun. performs during Day 3 of the Coachella Valley Music & Arts Festival 2011 held at the Empire Polo Club on April 17, 2011 in Indio, California. (Photo by Karl Walter/Getty Images)

#02 Kelly Clarkson "Stronger (What Doesn't Kill You)"

Kelly Clarkson performs at the Staples Center during the 54th Grammy Awards in Los Angeles, California, February 12, 2012. AFP PHOTO Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

#01 Train "Drive By"

LAS VEGAS, NV - OCTOBER 29: Singer Patrick Monahan of Train performs onstage during the Andre Agassi Foundation for Education's 16th Grand Slam for Children benefit concert at the Wynn Las Vegas on October 29, 2011 in Las Vegas, Nevada. The event raises funds to help improve education for underserved youth in the Las Vegas community. (Photo by Ethan Miller/Getty Images)